US5290483A
Expired / Lapsed
US
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Electrically conductive blends of intrinsically conductive polymers and thermoplastic polymers and a process for their preparation
Assignee: Americhem Inc
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Filing: 1993-06-22
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Granted: 1994-03-01
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Expires: 2013-06-22
Abstract
Abstract A process for preparing a conductive polymer article comprises the steps of preparing a dispersible neutral intrinsically conductive polymer; dispersing the intrinsically conductive polymer in a thermoplastic polymer to form a blend; processing the blend into the shape of the desired article; and, contacting the processed article with a dopant solution capable of both swelling the thermoplastic polymer and doping the intrinsically conductive polymer. A process for preparing neutral polyaniline comprises the steps of neutralizing doped polyaniline with a sodium carbonate solution and washing the polyaniline with a polyethyleneglycol solution. A conductive polymer article comprises a blend of an intrinsically conductive polymer and a thermoplastic polymer which is subsequently doped. A conductive polymer blend according to the invention, includes polyaniline, or insulating thermoplastic material and carbon black.
Inventors
- 👤 Vaman G. Kulkarni
- 👤 Bernhard Wessling
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 14:22
CPC Classifications
C; C08; C08J; C08J5/00; C08J5/18; H; H01; H01B; H01B1/00; H01B1/06; H01B1/12; H01B1/124; H01B1/128; C08L; C08L79/00; C08L79/02; C08L101/00; C08L23/00; C08L23/02; C08L23/04; C08L23/06; C08L27/00; C08L27/02; C08L27/04; C08L27/06
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
111 words
A process for preparing a conductive polymer article comprising the steps of: preparing a dispersible neutral intrinsically conductive polymer by neutralizing a doped intrinsically conductive polymer with a base solution to form a wet filter cake; and washing said wet filter cake of said neutralized intrinsically conductive polymer with a dispersing aid; said dispersing aid being a solution of polyethylene glycol in water; dispersing said neutral, intrinsically conductive polymer in a thermoplastic polymer to form a blend; processing said blend into the shape of the desired article; and, contacting said processed blend with a dopant solution, whereby said dopant solution swells said thermoplastic polymer, and dopes said neutralized intrinsically conductive polymer.
Claim 2
Dependent Claim
111 words
A process for preparing a conductive polymer article comprising the steps of: preparing a dispersible neutral intrinsically conductive polymer by neutralizing a doped intrinsically conductive polymer with a base solution to form a wet filter cake; and washing said wet filter cake of said neutralized intrinsically conductive polymer with a dispersing aid; said dispersing aid being a solution of polyethylene glycol in water; dispersing said neutral, intrinsically conductive polymer in a thermoplastic polymer to form a blend; processing said blend into the shape of the desired article; and, contacting said processed blend with a dopant solution, whereby said dopant solution swells said thermoplastic polymer, and dopes said neutralized intrinsically conductive polymer.
Claim 3
Dependent Claim
15 words
A process as set forth in claim 1, wherein said intrinsically conductive polymer is polyaniline.
Claim 4
Dependent Claim
37 words
A process as set forth in claim 1, wherein said thermoplastic polymer is selected from the group consisting of nylon 6, 6/6, 12 and 11, as well as copolymers and terpolymers thereof; polyethylene terephthalate; polycarbonate; and, polyurethane.
Claim 5
Dependent Claim
16 words
A process as set forth in claim 1, wherein said blend is thermo-processed into a film.
Claim 6
Dependent Claim
15 words
A process as set forth in claim 1, wherein said blend is thermo-processed into fibers.
Claim 7
Dependent Claim
60 words
A process as set forth in claim 1, wherein said dopant solution is selected from the group consisting of dilute formic acid solutions having a concentration of from about 10 to about 99 percent by weight of formic acid; mixtures of formic acid and and organic sulfonic acids; and, mixtures of formic acid and phosphoric acid and phosphoric acid derivatives.
Claim 8
Dependent Claim
59 words
A process as set forth in claim 1, wherein said dopant solution is selected from the group consisting of dilute formic acid solutions having a concentration of from about 10 to about 99 percent by weight of formic acid; mixtures of formic acid and organic sulfonic acids; and, mixtures of formic acid and phosphoric acid and phosphoric acid derivatives.
Claim 9
Dependent Claim
40 words
A process as set forth in claim 1, wherein said blend comprises from about 1 to about 30 percent by weight of said intrinsically conductive polymer and from about 99 to about 70 percent by weight of said thermoplastic polymer.
Claim 10
Dependent Claim
36 words
A process as set forth in claim 1, further comprising the initial step of forming a predispersion of said intrinsically conductive polymer with a polymer material which is at least partially compatible with said thermoplastic polymer.
Claim 11
Dependent Claim
28 words
A process as set forth in claim 9, wherein said polymer material of said predispersion is selected from the group consisting of polycaprolactone and nylon copolymers and terpolymers.
Claim 12
Dependent Claim
18 words
A process as set forth in claim 1, wherein said intrinsically conductive polymer is blended in powder form.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
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| 3.5 Years (Year 4) | 1997-02-28 | 1997-08-30 | 1998-03-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2001-02-28 | 2001-08-30 | 2002-03-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2005-02-28 | 2005-08-30 | 2006-03-01 | $7700.00 | Window Closed / Lapsed |